Core bit drilling tool



Jan. 27, 1959 D. H. JAHNKE 2,870,993

vGORE BIT DRILLING TOOL Filed Sept. 27, 1956 I.I" m -mn: i

24 ,5 ,5 2 5,3229 7 5*@ I' Q 0 /0 f /9 INVENTOR.

CORE BIT DRILLMG 'DOQL 'nl )avid H. Jahnke, Detroit, Mich., assignor toKoebel `Diamond Tool Co., Detroit, ,Mch a corporation of Michigan.Apprannsepfemnr .27, ,1956. Seria .Isa-612.504 j 1'8 Claims. (Cjl'.Z55- 47) This invention relates to drilling tools and more particularlyto `tools embodying core bits or core drills useful in drilling with acoolant into .various `wall `surfaces or formations. The core bitsincorporated in the tools or devices are frequently equipped ywithdiamonds on .the cutting or drilling portions thereof -in order toincrease the drilling or cutting rate and 1prolong lthe life of `thebits. The drilling tool .embodying the .present linvention is equippedwith improved means `not only for introducing under pressure a .coolantVliquid `to the drilling or cutting locality so as to cool and flushlthe working face or portions of the core bitbut also for disposing ofthe `coolant and cuttings after the coolant has passed the .bit face.

in the `construction industries, vfor example, drilling with .a `coolantof floors, walls Vand .ceilings is frequently accomplished by means ofportable hand drills not in themselves equipped to introduce fthecoolant, such `as water, to the working face of the cutting or coretbit.

4This practice has necessitated the `use 4with the tool .of .a

water swivel which is attached to the drill and to which the cutting bitis attached. During drilling operations `the` `onto the operatoihimself. In addition, it A:has frequently necessitated the collection or.disposal of the coolant .and

`cuttings `by means of pumps orother added equipment.

Frequently ithas added unnecessarily fand o bjectionably to the distance.between the work surface -and `the motivating unit.

The present invention eliminates the foregoing disadvantages `including-the necessity of Vusinga water swivel and, as distinguished fromconventional `practice, provides a convenient, effective and relativelysimplemethd `of performing the functions of introducing coolant and`removing cuttings -at the bit face and also disposing of the coolantand cuttings .in effective and efiicient inanner after they have passedthe rbit -face. AIn addition to the foregoing `the tool embodying thepresent invention provides a safe, lconvenient and easy means `forenabling the operator to hold and control the `tool and the cutting bitcarried thereby atanylocality and during the entire vperiod ofoperation.

In accordance with the embodiment of `the invention therein illustrated,by |.way .of example, `there is provided an annular diamond studded corebit suitably-affixed lto the forward yend of Va hollowtube or bit body.-The rear end of this tubular bit=body is aiixed -to apower driven shaftoperativeto rotate the bit `body as well as vthe core bit. In Athe fullyretracted position thereof ,the tubular Lbit `body and core -bit areentirely encased -within a staatent O .being practiced or carried out invarious ways.

2,870,993 .Patented Jan- 27, 1959 ice tionary cylindrical shell orjacket of somewhat larger diralrneter than the cylindrical bit body soas to provide .a relatively narrow annular space therebetween. The for-`ward end of the stationary shell or jacket carries a sealing ringadapted to lbe held against and insealing engage- :melit with theSurface 0f the material being ,drilled .and to encircle the drillopening therein. Adjacent to but rearwardly of ythe foregoing sealingring there islinterposed between the tubular bit body and the outercylindricaltpsrhell a isecond sealing ring. At the rear end of theoutershell there is interposed between the shell and, for example, the,operating shaft la third `sealing ring. The three sealing rings ineffect divide the annular space between the tubular bit 4body and theouter shell or jacket into two longitudinally spaced front and rearwater tight chfimbers sealed one from the other. The rear end cf thetubular -bit body is provided with `annularly spaced ports or aperturesfor enabling the coolant therein to pass `from the fbit fbody into therear water tight charnber. During Aoperation liquid coolant isintroduced under pressure into the front water tight chamber from where.it .is Vforced into the area between `the core `bit and the .material.being drilled. Thence the ,coolant is vforced aroundthe face ofthe bitpast the core and into the cylindrical `bit body from where `it isdischarged through the ports or apertures `therein into the .rear water.tight chamber. From this chamber the coolant and the cuttings entrained`therewith flow through a hollow hanjdle, attached to the .outer shellor jacket adjacent .the rearend thereof, and into azhose forcon'venientdisposal.

`Otherobjects `of Athis invention will appear in .-theffollow-ingdescription and appended claims', .reference .being `fhad `to vtheaccompanying drawings `forming a. part of v.this specication whereinVlike reference charactesdesig- .nate corresponding parts in the.several views.

.Fig. `l `is a `fragmentary sectional side elevation rillusvtratingacore lbit .drilling tool constructed in accordance `with the presentinvention.

Fig. 2 is a front end elevation .ofithe structure .shown :in Fig al.

Fig. `3 is a fragmentary 'sectional view of `therforward .portion of`the .tool shown in Fig. .l but illustrating the .core bit in .operatingposition.

"Before explaining `in detail the present :invention it is ytoibeunderstood that the invention is not `limited in .its application to-the details of `construction and arrangement of t parts illustrated .in.the accompanying-drawings,.since theinvention .is Acapable of otherembodiments and of Also it isto be understood that the phraseology orterminology employed herein is jfor the purpose of description `and notof limitation.

Referring "to the `accompanying drawings there lis `illusllll, .bywayofexample, a core bit drilling `tool provided Ltpbze er cylindricalbit body 11. The rear'end of lthe .fend yQf mower drive- Shaft 1:2Operative to rotate the t ibe llnisfsuitably aixed in sealing relationtothe forward tube 11 and the core bit 10 carried thereby.

#In its `fully retracted position shown in Fig. l the tube 5131is=housed within a stationary cylindrical shell .or

1jacketxf13, the latter being of somewhat greaterdiameter thantthe tube11 so as to provide an annularspace `14 therebetween The length of theshell `or jacket 13 will vary in accordance with the length of thehollow inner Ntube "1-1 which in turn is determined-by thedepth ofthefamosos member forming with the end of the shell an annular slot intowhich a front sealing ring 16 extends and is held in fixed positiontherein in any suitable manner. The sealing ring 15 may be fabricatedfrom soft synthetic rubber and, as illustrated in Fig. 1, projectssomewhat forwardly of the bit 10 in the latters fully retractedposition. Rearwardly of the front sealing ring 16 and preferablyproximate thereto is an annular metallic holder 17 disposed Within thecylindrical shell 13 and secured thereto. A front slip sealing ring 18is secured within the holder 17 and projects slightly inwardly thereofto effect sealing engagement with the tubular bit body 11. This sealingring may also be fabricated from Soft synthetic rubber. The outercylindrical jacket 13 terminates in an inwardly liangedy rear end 13aaperturedl to freely receive the shaft 12. Adjacent this lianged endthere Ais secured within the jacket 13 a retainer ring 19 also aperturedto receive freely the shaft 12. A rear slip sealing ring 20, preferablyformed of synthetic rubber, is held between the flange 13a and theretainer ring 19 and is adapted to have slip sealing engagement with theshaft 12.

It will be observed that a front annular chamber 21 is formed betweenthe sealing rings 16 and 18, this chamber being water tight through themedium of these sealing rings during operation of the tool, as shown inFig. 3. A rear water tight annular' chamber 22 is formed between thefront sealing ring 18 and the rear sealing ring 20, this annular chamberbeing disposed in the space between the outer shell or jacket 13 and theinner tube 11 and being sealed by virtue of the coaction of the Sealingrings 18 and 20, respectively, with the tubular bit body 11 and theshaft 12. The rear end of the tubular bit .body 11 is provided with aseries of annularly spaced ports or apertures 23 providing communicationbetween the end of the bit body and the rear end 0f the annular chamber22. From the foregoing it will be seen that in operation the threeyieldable sealing rings 16, 18 and 20, formed preferably of syntheticrubber, in effect divide the annular space 14 between the tubular bitbody 11 and the outer shell or jacket 13 into two longitudinally spacedfront and rear water tight chambers 21 and 22 which are sealed one fromthe other.

In advance of the front sealing ring 18 the outer shell orjacket 13 isprovided with a water inlet 24. This jacket is also provided with anenlarged rear outlet opening 25 providing communication between theannular space 14 and a hollow cylindrical handle 26 which preferablyinclines downwardly and rearwardly. Held in iixed communication with thewater inlet opening 24 is an annular hose connection orl coupling member27 which is secured to the shell or jacket 13. Removably attached tothis coupling 27 in embracing relation thereto is a heavy duty mbberhose 28. This hose extends rearwardly to a point proximate to the upperend of the handle 26 and thence extends downwardly along the front faceof the handle. The hose member 28 may be held in position by means of asuitable number o-f clips 29 embracing the hose and attached to theshell 13 and the handle 26. Through the medium of any conventionalcoupling 30 the lower end of the rubber hose 28 may be attached to laflexible inlet hose 31 also preferably formed of heavy duty rubber. Theinlet hose 31 is connected to a source of water supply from which waterunder pressure may be forced through the inlet hose 28 and coupling 27into the front annular chamber 21.

As illustrated particularly in Fig. 2, a yoke member 32 embraces thelower part of the shell 13, the upper ends of the yoke being pivoted at33 to opposite sides of the shell. As illustrated in Fig. l, the yoke 32is inclined downwardly and rearwardly and terminates in a dependinghandle 34 provided with a terminal finger engaging portion 34a suitablydisposed in advance of the handle 26. The yoke 32 is formed with aprojecting sealing knob 35 v normally disposed immediately below and inclose relais grasped in the hand the finger engaging portion 34ay may bereadily retracted, as illustrated in broken lines in Fig. l, so as tocause the sealing knob to compress the rubber hose 28 so as either torestrict or fully prevent the flow of water therethrough.

The lower end of the hollow handle 26 is provided in any conventionalmanner with a threaded connection 36 into which the threaded nipple 37of a garden hose 38 of any standard type may be detachably connected.From this construction it will be apparent that the water or otherliquid coolant together with the cuttings entrained therewith will bedischarged from the chamber 22 through the hollow handle 26 and thencethrough the discharge hose 38 to the desired locality for convenientdisposal thereof.

With reference to Fig. 3 it will be seen that, during rotation of thebit 10 and progressive forward travel imparted thereto by the shaft 12,the bit while rotating about its central axis will drill an annular hole39 in the work W. During such operation the front sealing ring 16 willbe held in sealing engagement with the face W of the work thus sealingthe annular chamber 21 between I the Asealing rings 16 and 18. Duringthe drilling operation performed by the annular bit or cutting head 10 acore 40 of the work will be produced and will progressively project intothe central cavity 11a ofthe cylin drical bit body 11. While thisoperation proceeds the liquid coolant is introduced under pressurethrough the inlet 24 into the front annular chamber 21 by means of thehose 28. Since the coolant liquid is under pressure it is consequentlyforced intovthe annular area or space 39 lying between the bit body 11and the adjacent surface of the material being drilled. Tlience thecoolant is forced around the face of the bit 10 and past the core 40into the central passage 11a of the bit body 11. The coolant andcuttings entrained therewith iiow to the rear end of the bit body 11 andthence passthrough the ports or apertures 23 into the rear Water tightchamber 22 formed between the tube 11 and the cylindrical shell orjacket 13. From the chamber 22 the coolant and entrained cuttings passthrough the hollow handle 26 and thence through the discharge hose 38.

I claim:

1. In a drilling device, a tubular bit body, a core bit supported on theforward end of said body, a cylindrical shell embracing said bit bodyand having the cylindrical wall thereof spaced outwardly of said body toprovide a longitudinally extending annular space therebetween, sealingmeans on the forward end of said shell for sealing the same when inengagement with the face of the work, a second sealing means interposedbetween said shell and bit body to provide a chamber between both ofsaid first and second named sealing means, a third sealing meansproviding a second chamber between said shell and body at a localityintermediate said second and third sealing means, said bit body beingprovided with a port' means for the flow of liquid coolant from said bitbody into said second chamber, means for introducing liquid coolant intosaid first named chamber, and means communicating with said second namedchamber for discharging liquid coolanttherefrom.

2. In a drilling device, a tubular bit body, a core bit supported on theforward end of said body, a cylindrical shell embracing said -bit bodyand having the cylindrical wall thereof spaced outwardly of said body toprovide a longitudinally extending annular space therebetween, sealingmeans on the forward end of said shell for scaling the same when inengagement with the face of the work, a second sealing means interposedbetween said shell and bit body to provide a chamber between both ofsaid first and second named sealing means, a third sealing meansproviding a second chamber between said shell and body at a localityintermediate said second and third sealing ineens, Asaid bit bodylbeing,provided with. a gpo'r't ,i means the bit through saidbit body and saidportmeans into ,said second ,named chamber, ,and fmeans .for.discharging liquid` Acoolant `from said second .namedchamben g `3. In,a drilling device, `a .tubular ,bit body,` 4al core ,bit supported onthe ,torwarfdendwbfsaidbody, a cylindrical shell `embracing saidbit`body and .having the `cylindrical wall Athereof spacedioutwardlytfsaidbody `to provide `a longitudinally extending, annular ,space,.therebetween, sealing means on the forward rend of Said shellfortsealing the same when "in engagement with .theffa'ceof the work, asecond sealing means interposed between `said shell and `bit body to`provide a `'(:harber betweenboth `of said first and second namedsealing means, a third `sealing means providing Aa `second chamberforwardly ,thereof "between .said shell and'body and rearwardly of saidsecond ,sealing .means, said bit body being,provided W'ith `a port meansfor the 'ilow `of liquid colant from said bit body Vinto s aid secondchamber, means fonintroducingliquid coolant into said first Anamedchamber, and means including a handle having a passage therethroughcommunicating with said second named chamber `for discharging liquidcoolant therefrom, i

4. In a drilling device, a tubular b'itbody, arcorebit supported on theforward end of saidbody,` a cylindrical shell embracing said bit bodytandhaving the cylindrical wall thereof spaced outwardly of said Sbodyto provide a longitudinally extending annular spaceV therebetween, seal-"ing means atthe forward end of vsaid shelli'for sealing the same whenin engagement with the face ofthe work, a second sealing :means,interposed `between .said shell and bit body to provide a chamberbetween both of said rst and second named sealing imeans, :a third`sealing means providing a second chamber between said shell yand body.and between both of said second and" third sealing means,

said bit body being provided with ,a port means for the flow of liquidcoolant from said ybit body into saidrsecond chamberLmeans forintroducing liquid coolant under pressureinto said first namedchamberfor flow `around 'the face of the core bit andthence away fromthe bit through said bit body and said port means into said second namedchamber, and means including a handle having a passage therethroughcommunicating with said second chamber for discharging liquid coolanttherefrom.

5. In a drilling device, a tubular bit body having a core bit at theforward end thereof, a hollow shell embracing said bit body and spacedoutwardly thereof, sealing means for sealing the forward end of saidshell against the face of the work, a second sealing means interposedbetween said shell and bit body to form with said first named sealingmeans a chamber between the shell and bit body, a third sealing meansproviding a second chamber between said shell and body and between bothof said second and third sealing means, means for introducing liquidcoolant into said rst named chamber for flow around the core bit andthence into said bit body, said bit body being provided with a portmeans in advance of said third sealing means for the flow of liquidcoolant from the bit body into said second chamber, and meanscommunicating with said second chamber for discharging liquid coolanttherefrom.

6. In a drilling device, a tubular bit body having a vcore bit at theforward end thereof, a hollow shell embracing said bit body and spacedoutwardly thereof, sealing means carried by the forward end of saidshell for sealing the same against the face of the work, a secondsealing means interposed between said shell and bit body to form withsaid rst named sealing means a chamber between the shell and bit body, athird sealing means providing a second chamber between said shell andbody rearwardly of said second sealing means, means for introdueingliquid 'coolant into said `first named elianibei `for flow aroundthecorebit and thence intofsaid'bitbody,

saidwbit body `beingprovided4 rwitlraport means `in advance of saidthird sealing .means forthe flow of liquid coolant `from thevbit :body4,into said second chamber, and means including .a handle `having apassage therein communicatfing :.with .said second chamber ata `localityintermediate .saidsecondand thirdsealingmeansfor discharging liquidcoolant therefrom.

`.providing asecond chamber between `said shellfand body ,rearwardly yofsaid second i sealingtmeans, a conduit; communicating with said zirstnamed chamber forintroducing liquid coolant `under.pressure.,thereinto.for ow around the core bit andthence into. said tubular hit body,lmeans foncontrolling thellow of coolant from saiclconduit into saidfirst named chamber, saidbit `,body .being pro- "from said bit body`'into saidl second chamber, andi-means for `discl'larfging liquidAcoolant yfrom said second `,chamber -at a `locality intermediate saidsecond and Athird sealing means.

8. In a drilling device, atubular bit body 4having Aa core .bit .at theforward endthereof, ahollow shell ernibracing said `bit body `and spacedoutwardly lthereof, sealing means carried b`y the forward `end offsaidshell for sealing the `same .against-the face of `the work, a-secondsealing .means interposedV betweenwsaid shell landl bit body to formwith said `first named sealing means ya chamber between .the shell andbit `bodypa thi-rd sealing means providing a second `chamber betweensaid shell and body rearwardly of `said second sealing means, a conduitcommunicating with said Vfirst -named chamber for introducingliquidcoolant under pressurethereinto forflow around thercore bit andthenceinto said tubular bit body, means for controllingtheflowof coolant fromsaid conduit into said. firstnamed Chambergfsaid bit-` body beingprovided with a port means for the flow of liquid coolant from said bitbody into said second chamber at a locality intermediate said second andthird sealing means, and means including a handle attached to said shelland having a passage therein communicating with said second chamber fordischarging coolant therefrom.

9. A drilling device according to claim 7 wherein said controlling meansincludes a pivotally mounted manually operable lever.

10. A drilling device according to claim 8 wherein said controllingmeans includes a pivotally mounted manually operable lever disposedproximate to said handle.

1l. In a drilling device, a tubular bit body having a core bit at theforward end thereof, a hollow shell ernbracing said bit body and spacedoutwardly thereof, sealing means carried by the forward end of saidshell for sealing the same against the face of the work, a secondsealing means interposed between saidl shell and bit body to form withsaid rst named sealing means a chamber between the shell and bit body, athird sealing means providing a second chamber between said shell andbody rearwardly of said second sealing means, a flexible conduitcommunicating with said first named chamber for introducing liquidcoolant under pressure thereinto for ilow around the core bit and thenceinto said tubular bit body, a swingable manually operable lever havingmeans engageable with said flexible conduit to compress the same andcontrol the llow of coolant into said first named chamber, said bit bodybeing provided with a port means for the ow of liquid coolant from saidbit body into said second chamber, and con- 7 duit means for dischargingliquid coolant from said second chamber.

12. A drilling device according to claim 11 wherein a depending handleis attached to said shell and through which said conduit means extends.

13. In a drilling device, a substantially cylindrical outer jacketadapted to be held in predetermined position relative to the work beingdrilled, work drilling means including a tubular bit body and a rotaryand axially shiftable shaft secured to the rear end of the bit body andextending therewith axially of and interiorly of said jacket, a core bitsecured to the forward end of said bit body, a plurality oflongitudinally spaced sealing devices for forming between said jacketand work drilling means a pair of longitudinally extending front andrear chambers sealed one from the other during the drilling operation,conduit means for introducing liquid coolant under pressure into saidfront chamber for llow around the core bit and thence rearwardly intosaid tubular bit body, said bit body being provided with a `the workbeing drilled, work drilling means including a tubular bit body and arotary and axially shiftable shaft secured to therear end of the bitbody and extending therewith axially of and interiorly of said jacket, acore bit secured to the forward end of said bit body, a plurality oflongitudinally spaced sealing devices for forming between said jacketand work drilling means a pair of longitudinally extending front andrear chambers sealed one from the other during the drilling operation,conduit means for introducing liquid coolant under pressure into saidfront chamber for flow around the core bit and thence rearwardly intosaid tubular bit body, said bit body being provided with a port meansfor the ow of liquid coolant from said bit body into said rear chamber,and means including a passage in said handle communicating with saidrear chamber for discharging liquid coolant therefrom.

15. A drilling device according to claim 13 wherein means is providedfor controllingrthe ow of liquid cool,- ant through said conduit meansinto said front chamber.

16. A drilling device according to claim 13 wherein manually operablelever means disposed proximate to said handle is provided forcontrolling the llow of liquid coolant through said conduit means intosaid front chamber.

17. A drilling device according to claim 1l wherein said lever ispivotally mounted on said shell, a depending handle being attached tosaid shell adjacent said lever and through which said conduitmeansextends.

18. In a drilling device, a substantially cylindrical outer jacket, ahandle extending from said jacket for manually holding said jacket inpredetermined position relative to the work being drilled, work drillingmeans including a tubular bit body and a rotary and axially shiftableshaft secured to the rear end of the bit body and extending therewithaxially of and interiorly of said jacket, a core bit secured to theforward end of said bit body, a plurality of longitudinally spacedsealing devices for forming between said jacket and work drilling means`a pair of longitudinally'extending front and rear chambers sealed onefrom the other during the drilling operation, conduit means including ailexible hose for introducing liquid coolant under pressure into saidfront chamber for flow around the core bit and thence rearwardly intosaid tubular bit body, said bit body being provided with a port meansfor the flow of liquid coolant from said bit body into said rear chamberat a locality intermediate said sealing devices, means communicatingwith said rear chamber for discharging liquid coolant therefrom, and aswingable manually operable lever engageable with said `hose forcompressing the same and controlling the tlow of liquid coolant intosaid front chamber.

References Cited in the tile of this patent UNITED STATES PATENTS296,681 McDerby Apr. 8, 1884 766,588 Brejcha Aug. 2, 1904 931,611Hutchings Aug. 17, 1909 1,517,556 Grant Dec. 2, 1924 2,091,023 ArterburyAug. 24, 1937 2,712,323 Snyder et al July 5, 1955

